Also, what other open datasets would it be interesting to reference to?

Context: My goal is to get the data re-used by as many projects/mashups as possible. No such re-users have been identified so far. Another goal is to make it into the LOD graph because it is cool haha.

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How you can improve it depends very much on how you want to use it, and who you want it to be useful for. 'Valid' RDF is fine, but may not be useful depending on your intended application! If you want it to be helpful to open/linked types, publishing it using other 'accepted' vocabularies is good (although schema.org is the best catch-all, it is not always as expressive as you want):

This also allows any internal applications you have to retrieve extra data from other sources (much as you have done with your wikidata links).

Another thing I'd suggest is that you consider how you're publishing the data, and have a look at the W3C Linked Data Platform principles. The two major points here are:

How you name your RDF resources. Try to give them a URI (in your rdf:resource) that means something rather than just a UUID - this is usually something affiliated with an organisation, or ideally re-using a URI for the same resource if it exists in DBpedia or Freebase.

Publish your data in friendlier formats (not just RDF/XML) unless you have a reason to only concentrate on RDF/XML. It is a horrible format; Turtle is better in every way and easier to work in (but you should provide both, as well as N-triples).

You also need to work out where to publish it to (if you want it out in the open) - this varies depending on what you want to do...